package main 
import(
	"fmt"
	"math/rand"
)

type keiven float64

func fakeSensor() keiven{
	return keiven(rand.Intn(151)+150)
}

func relSensor() keiven{
	return keiven(0)
}

func main(){
    sensor:=fakeSensor
	fmt.Println(sensor())
	sensor=relSensor
	fmt.Println(sensor())
}